In OS X the default is for the function keys to perform device specific tasks like volume, brightness, etc. you have to press the Fn key to access them as function keys. In windows they work fine as function keys.

Only problem I have is switching from cmd-c to ctrl-c for copy, paste, etc.

to pause a game is Fn+Esc. To content fill aware in Photoshop is Fn+Shift+F5, to open the brushes palette is Fn+F5... What else... To make the @ is right alt+2. Those shortcuts are the ones I found so far in Bootcamp.